ant out of the box. Ant should now build with an empty classpath. I haven't made
the changes for Unix scripts yet.

Also separated the building of ant.jar and optional.jar so that local
builds should more closely match distributions. There is a lot of duplication
between a normal build and a distribution build which can probably be readily
removed now.


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@268380 13f79535-47bb-0310-9956-ffa450edef68